J. Mater. Sci. Technol. ›› 2021, Vol. 73: 165-170.DOI: 10.1016/j.jmst.2020.09.037

• Research Article • Previous Articles     Next Articles

Nucleation kinetics of paramagnetic and diamagnetic metal melts under a high magnetic field

Zhipeng Longa, Qiuyue Jianga, Jiantao Wanga, Long Houa, Xing Yua, Yves Fautrelleb, Zhongming Rena, Xi Lia,b,*()   

  1. aState Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072, China
    bSIMAP-EPM-Madylam/G-INP/CNRS, PHELMA, BP 75, 38402, St Martin d’Heres Cedex, France
  • Received:2020-05-07 Revised:2020-06-07 Accepted:2020-06-29 Published:2021-05-20 Online:2020-10-04
  • Contact: Xi Li
  • About author:*State Key Laboratory of Advanced Special Steels,Shanghai University, Shanghai 200072, China.E-mail address: lx_net@sina.com (X. Li).

Abstract:

The influence of a high magnetic field (HMF) on the nucleation kinetics of paramagnetic aluminum and diamagnetic zinc melts has been investigated by differential thermal analysis (DTA). It is found that the application of an HMF increases the undercooling of pure aluminum and pure zinc at the same heating-cooling rates. Moreover, the quantitative analysis of activation energy calculated from the DTA results using the Kissinger method manifests that the HMF reduces the activation energy of pure aluminum and pure zinc. Regardless of magnetism, the nucleation frequency under an HMF is higher than that without an HMF. Furthermore, the increase in undercooling under the HMF is mainly attributed to the increase of the contact angle, calculated by the functional relationship between the cooling rate and undercooling. This result is consistent with the increase of the calculated nucleation work for pure aluminum and pure zinc. Additionally, the increase in undercooling caused by the HMF is partly ascribed to the magnetic field-induced suppression of thermal convection in the undercooled melt.

Key words: Undercooling, Activation energy, Nucleation work, High magnetic field